package com.coocaa.x.app.hall.topic;

import android.graphics.Bitmap;

/**
 * Created by sunny on 15-6-21.
 */
public class BitmapUtil {

    public static Bitmap
    BoxBlurFilter(Bitmap bmp) {

/** 水平方向模糊度 */
        float hRadius = 10;
/** 竖直方向模糊度 */
        float vRadius = 10;
/** 模糊迭代度 */
        int iterations = 7;
        int width
                = bmp.getWidth();
        int height
                = bmp.getHeight();
        int[]
                inPixels = new int[width
                * height];
        int[]
                outPixels = new int[width
                * height];
//        Bitmap
//                bitmap = Bitmap.createBitmap(width, height,Bitmap.Config.ARGB_8888);
        bmp.getPixels(inPixels,
                0,
                width, 0,
                0,
                width, height);
        for (int i
             = 0;
             i < iterations; i++) {
            blur(inPixels,
                    outPixels, width, height, hRadius);
            blur(outPixels,
                    inPixels, height, width, vRadius);
        }
        blurFractional(inPixels,
                outPixels, width, height, hRadius);
        blurFractional(outPixels,
                inPixels, height, width, vRadius);
        bmp.setPixels(inPixels,
                0,
                width, 0,
                0,
                width, height);
        return bmp;
    }

    public static void blur(int[]
                                    in, int[]
                                    out, int width,
                            int height,
                            float radius) {
        int widthMinus1
                = width - 1;
        int r
                = (int)
                radius;
        int tableSize
                = 2 *
                r + 1;
        int divide[]
                = new int[256 *
                tableSize];

        for (int i
             = 0;
             i < 256 *
                     tableSize; i++)
            divide[i]
                    = i / tableSize;

        int inIndex
                = 0;

        for (int y
             = 0;
             y < height; y++) {
            int outIndex
                    = y;
            int ta
                    = 0,
                    tr = 0,
                    tg = 0,
                    tb = 0;

            for (int i
                 = -r; i <= r; i++) {
                int rgb
                        = in[inIndex + clamp(i, 0,
                        width - 1)];
                ta
                        += (rgb >> 24)
                        & 0xff;
                tr
                        += (rgb >> 16)
                        & 0xff;
                tg
                        += (rgb >> 8)
                        & 0xff;
                tb
                        += rgb & 0xff;
            }

            for (int x
                 = 0;
                 x < width; x++) {
                out[outIndex]
                        = (divide[ta] << 24)
                        | (divide[tr] << 16)
                        |
                        (divide[tg] << 8)
                        | divide[tb];

                int i1
                        = x + r + 1;
                if (i1
                        > widthMinus1)
                    i1
                            = widthMinus1;
                int i2
                        = x - r;
                if (i2
                        < 0)
                    i2
                            = 0;
                int rgb1
                        = in[inIndex + i1];
                int rgb2
                        = in[inIndex + i2];

                ta
                        += ((rgb1 >> 24)
                        & 0xff)
                        - ((rgb2 >> 24)
                        & 0xff);
                tr
                        += ((rgb1 & 0xff0000)
                        - (rgb2 & 0xff0000))
                        >> 16;
                tg
                        += ((rgb1 & 0xff00)
                        - (rgb2 & 0xff00))
                        >> 8;
                tb
                        += (rgb1 & 0xff)
                        - (rgb2 & 0xff);
                outIndex
                        += height;
            }
            inIndex
                    += width;
        }
    }

    public static void blurFractional(int[]
                                              in, int[]
                                              out, int width,
                                      int height,
                                      float radius) {
        radius
                -= (int)
                radius;
        float f
                = 1.0f
                / (1 +
                2 *
                        radius);
        int inIndex
                = 0;

        for (int y
             = 0;
             y < height; y++) {
            int outIndex
                    = y;

            out[outIndex]
                    = in[0];
            outIndex
                    += height;
            for (int x
                 = 1;
                 x < width - 1;
                 x++) {
                int i
                        = inIndex + x;
                int rgb1
                        = in[i - 1];
                int rgb2
                        = in[i];
                int rgb3
                        = in[i + 1];

                int a1
                        = (rgb1 >> 24)
                        & 0xff;
                int r1
                        = (rgb1 >> 16)
                        & 0xff;
                int g1
                        = (rgb1 >> 8)
                        & 0xff;
                int b1
                        = rgb1 & 0xff;
                int a2
                        = (rgb2 >> 24)
                        & 0xff;
                int r2
                        = (rgb2 >> 16)
                        & 0xff;
                int g2
                        = (rgb2 >> 8)
                        & 0xff;
                int b2
                        = rgb2 & 0xff;
                int a3
                        = (rgb3 >> 24)
                        & 0xff;
                int r3
                        = (rgb3 >> 16)
                        & 0xff;
                int g3
                        = (rgb3 >> 8)
                        & 0xff;
                int b3
                        = rgb3 & 0xff;
                a1
                        = a2 + (int)
                        ((a1 + a3) * radius);
                r1
                        = r2 + (int)
                        ((r1 + r3) * radius);
                g1
                        = g2 + (int)
                        ((g1 + g3) * radius);
                b1
                        = b2 + (int)
                        ((b1 + b3) * radius);
                a1
                        *= f;
                r1
                        *= f;
                g1
                        *= f;
                b1
                        *= f;
                out[outIndex]
                        = (a1 << 24)
                        | (r1 << 16)
                        | (g1 << 8)
                        | b1;
                outIndex
                        += height;
            }
            out[outIndex]
                    = in[width - 1];
            inIndex
                    += width;
        }
    }

    public static int clamp(int x,
                            int a,
                            int b) {
        return (x
                < a) ? a : (x > b) ? b : x;
    }
}
